Evaporative Emission System Component Layout for Straddled Vehicles
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Solution Overview
Problem
In straddled vehicles, the evaporative emission system components for leak testing face interference issues with electric wires and gas passages due to their compact arrangement within limited spaces, necessitating a configuration that avoids such interference while maintaining support stiffness.
Innovation Solution
The components for leak testing, including a pressure sensor, vent valve, and suction pump, are strategically supported by the frame, storage box, engine body, intake system, or fuel system components, using their common characteristics of larger volume, surface area, and elongated shapes to obtain support stiffness, allowing for efficient arrangement to avoid wire and gas passage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If components for leak testing (pressure sensor, vent valve, suction pump) are arranged within the limited space of the straddled vehicle, then the vehicle maintains compact component layout, but electric wires and gas passages connected to these components interfere with other components
Solution Approach 1:
The patent applies dimensional arrangement by strategically positioning leak testing components in the vertical direction (between the seat and storage box) and utilizing three-dimensional space distribution. The pressure sensor, vent valve, and suction pump are arranged at different vertical levels and horizontal positions, allowing electric wires and gas passages to be routed along the frame without interfering with other components. This spatial distribution in multiple dimensions resolves the interference problem while maintaining compact layout.
2Strength
If components for leak testing are supported by the frame, seat, or storage box, then support stiffness is obtained, but the arrangement space becomes more constrained
Solution Approach 1:
The patent applies multi-functionality by utilizing the frame, seat, and storage box not only for their primary structural and storage functions but also as support structures for the leak testing components. The frame supports the pressure sensor and gas passage routing, the seat provides mounting for the vent valve, and the storage box accommodates the suction pump. This approach obtains necessary support stiffness while efficiently using existing structural elements, avoiding additional space-consuming support structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables effective leak testing of the evaporative emission system by ensuring the components are securely supported and arranged to prevent interference with other components, enhancing the system's air-tightness and operational efficiency.
Implementation Method 1
a pressure sensor configured to measure a pressure in a gas passage in the evaporative emission system
Implementation Method 2
an electric vent valve configured to switch between a closed state in which the outside-air-introduction passage is closed and an open state in which the outside-air-introduction passage is open
Implementation Method 3
an electric suction pump configured to suck a gas in the gas passage
Implementation Method 4
The evaporative emission system causes the fuel evaporation gas that has flowed from the fuel tank into the canister through the purge pipe to be adsorbed onto activated carbon in the canister
Data Source
AI summary
A vehicle includes a frame, a seat, a storage box, an engine body at least partially overlapping with the seat when seen from above, an intake system component, a fuel system component, an evaporative emission system, a pressure sensor, and at least one of an electric vent valve or an electric suction pump. At least one of the pressure sensor, the vent valve, or the suction pump is supported by at least one of a frame, a storage box, an engine body, an intake system component, or a fuel system component.